What Makes a City? An Introduction to Urban Geography

What Makes a City? An Introduction to Urban Geography

The Places Where We Live Together

Think about where you woke up this morning. Maybe you were in a small bedroom in a quiet house, or perhaps you shared a room with a sibling in an apartment building. Now think about walking to school or riding a bus to get there. Along the way, you probably passed by different kinds of buildings—houses and apartments, stores and restaurants, maybe a park or a church. All of these places, put together in one area where many people live close to one another, make up what we call a city.

A city is a special kind of place where thousands, sometimes millions, of people share the same space. They might not all know each other, but they share something important: the same streets to walk on, the same water to drink, the same schools to attend, and often the same buses and trains to ride. Cities are like giant puzzles, with many different pieces—homes, businesses, parks, and roads—all fitting together in interesting ways.

When you look at a city from far above, perhaps from the top of a tall building or in a photograph taken from an airplane, you can see patterns in how these pieces fit together. You might notice that some areas have many buildings packed close together, while other areas have buildings spread far apart with lots of empty space between them. Some cities have a central area with tall buildings, while others seem to stretch out in every direction without any clear center. These patterns tell us a lot about how the city works and why it grew the way it did.

In this chapter, you will learn what cities are, how they are organized, and why they look the way they do. You will discover that cities are not random—they follow certain rules and patterns that geographers, the scientists who study places and how people use them, have been trying to understand for hundreds of years. Most importantly, you will begin to understand why Los Angeles, the city you will learn about in this book, is one of the most unusual and fascinating cities in the world.

Cities Throughout History: How People Built Places to Live

Ancient Cities Built Around Rivers

The very first cities were built thousands of years ago, long before cars, trains, or even paved roads. The ancient Egyptians built their cities along the Nile River, the great body of water that flows through Egypt in North Africa. The Nile provided everything the ancient Egyptians needed: fresh water for drinking and watering their crops, fish for food, and an easy way to travel from place to place using boats. The river was like a superhighway made of water, connecting different parts of the city and allowing people to trade goods with neighbors far away.

Similarly, the ancient city of Babylon, one of the most famous cities of the ancient world, was built along the Tigris and Euphrates rivers in what is now Iraq. The Mesopotamian civilization, one of the earliest in human history, flourished between these two rivers, using them for the same reasons the Egyptians used the Nile. Farmers could grow wheat and barley in the rich soil along the riverbanks, and merchants could ship their goods to markets downstream. The rivers defined where the city would grow, and the city grew to take advantage of everything the river offered.

In Asia, the ancient Chinese civilization developed along the Yellow River and the Yangtze River. These rivers fed the fields that grew rice, the food that would become the staple of Chinese cuisine for thousands of years. Cities like Xi'an, which served as the capital of ancient China for many dynasties, grew up where these rivers provided water and transportation.

Even today, you can see how important rivers were to these ancient cities by looking at where they were built. Nearly all of the world's oldest cities are located next to major rivers or coastlines. Water was essential for survival, and cities grew wherever water was abundant.

Medieval Cities Built Around Castles

As time went on and technology improved, cities began to grow in new locations and in new shapes. During the medieval period in Europe, which lasted from roughly 500 to 1500 CE, many cities were built around castles and fortifications. These castle cities, called walled cities because they were often surrounded by large stone walls, were designed to protect people from attacks by enemies.

Think about a medieval castle sitting on top of a hill. The castle was the strongest and safest place in the entire region, so people wanted to live near it. They built their houses and shops inside the walls, close to the castle where they could find protection. Over time, more and more people moved inside the walls, and the cities became very crowded. Streets were narrow and winding, built to fit the irregular shape of the land inside the walls.

Some famous medieval cities you might have heard of include York in England, with its famous city walls still standing today; Carcassonne in France, which looks like something from a fairy tale with its double ring of walls and 52 towers; and Prague in the Czech Republic, whose old city center still has the same winding streets and cramped buildings it had in medieval times.

These medieval cities had something important in common: they were compact, meaning everything was close together. Because the walls limited how far the city could spread, people had to live and work in a relatively small area. You could walk from one end of the city to the other in just a few minutes. This closeness made it easy for people to meet and do business with each other, but it also meant that the cities could become very crowded and unhealthy, with garbage and waste building up in the narrow streets.

Modern Cities Built Around Transportation

The invention of new technologies in the 1700s and 1800s changed everything about how cities were built. First came canals, artificial waterways that could be dug to connect cities to rivers and oceans. Then came railroads, huge networks of iron tracks that could carry people and goods much faster than any horse-drawn carriage. Later came streetcars, automobiles, and finally airplanes.

Each new form of transportation allowed cities to grow in new ways. With canals and railroads, cities were no longer forced to grow right next to rivers. They could be built anywhere along a railroad line, even in places that had no water at all. Towns would spring up around train stations, with businesses and homes clustered near the platform. These new railroad cities could stretch out much farther than the old medieval cities, but they still tended to have a clear center, usually right around the main train station.

When automobiles became common in the early 1900s, cities changed even more dramatically. With cars, people could live much farther from their jobs and still drive to work every day. This allowed cities to spread out in all directions,吞吞 much larger areas of land than ever before. The automobile city looked very different from the medieval city: instead of narrow streets and crowded buildings, there were wide roads, parking lots, and houses spread far apart on large plots of land.

The transportation revolution also changed how people thought about distance. In a medieval city, walking was the main way to get around, so everything had to be close together. In a modern automobile city, people could travel many miles in just a few minutes, so things could be spread out much more. This fundamental change in how we move around has shaped the cities we live in today, especially places like Los Angeles, which you will learn about later in this book.

Understanding Population Density: Packed In or Spread Out?

What Is Population Density?

One of the most important ideas in urban geography is population density. Population density tells us how many people live in a given area. If you have a neighborhood where many people live close toge