Tulsa is the second-largest city in the state of Oklahoma and is known as the "Oil Capital of the World." The city's economy was built on the success of the oil industry, which boomed in the early 20th century. Tulsa became a major hub for oil production, refining, and transportation, with numerous oil companies establishing their headquarters in the city. The oil industry played a significant role in shaping Tulsa's skyline, with many iconic Art Deco buildings constructed during this time.

Freight transportation is a vital part of Tulsa's economy, as the city is strategically located at the crossroads of major highways and rail lines. Tulsa is served by several interstate highways, including I-44, I-244, and the historic Route 66. These highways connect Tulsa to other major cities in the region and facilitate the transportation of goods and materials. The city is also served by the Tulsa Port of Catoosa, which is the furthest inland seaport in the United States and provides access to international trade via the McClellan-Kerr Arkansas River Navigation System.

Dubuque is a city located in the state of Iowa, along the Mississippi River. It is the oldest city in Iowa and was originally settled by French fur traders in the 17th century. The city was named after Julien Dubuque, a French-Canadian explorer who was granted permission by the Meskwaki tribe to mine lead in the area. The mining industry played a significant role in the early development of Dubuque, and the city became a major center for lead mining in the 19th century.

Freight transportation has been a crucial part of Dubuque's history and economy. The city's location along the Mississippi River made it an important transportation hub for goods and products. In the early days, steamboats were the primary mode of transportation, carrying goods up and down the river. The arrival of the railroad in the mid-19th century further enhanced Dubuque's transportation capabilities, connecting the city to other major markets and facilitating the movement of goods. Today, Dubuque is still a vital transportation hub, with a well-developed infrastructure that includes highways, railroads, and a port along the Mississippi River.