The Midwest is the crossroads of American transportation — the place where railroads, highways, and airways converge. Chicago's O'Hare International Airport is one of the busiest airports in the country, serving as a hub for both United Airlines and American Airlines. Minneapolis-Saint Paul International is a major Delta hub. Together, these airports connect the heartland to the rest of the world.

Chicago's transportation heritage runs deeper than aviation. The city's L train has been running since 1892, and its elevated Loop is one of the most iconic transit features in America. Union Station in Chicago is a major Amtrak hub, connecting passengers to long-distance routes across the country. The city was also the railroad capital of America in the 19th century, with more track converging on Chicago than any other city.

The Midwest's role in automotive history is unmatched. Detroit, Michigan built the American automobile industry — Ford, GM, and Chrysler all have their roots there. The Indianapolis Motor Speedway in Indiana has hosted the Indy 500 since 1911. Michigan's Mackinac Bridge connects the state's two peninsulas and is one of the most impressive spans in the country. The Midwest built the machines that put America on wheels.

This quiz covers the heartland's transportation network from every angle — airports, rail, transit, bridges, and the auto industry. The Midwest doesn't get the glamour of the coasts, but its transportation infrastructure is the backbone that holds the entire American network together.