Railroads and the telegraph i believe
The Oval Office was built in 1909 as part of the West Wing expansion of the White House during President William Howard Taft's administration. It replaced the previous Oval Office located in the center of the building.
It was a way of getting people and things there quicker. Supplies such as food and building materials helped in the development in the west.
The Aldis in West Bend Wisconsin was built in 1976.
People used boats and ships more often in those days.By building canals in the West, people would be more likely to go there if they weren't built.
Industrialism
Some leaders influenced the expansion, and due to rising population in the west.
The Spanish-American war and US occupation of Cuba and the Phillipines, among other things.
The Gateway Arch was designed in the early 1940s as part of the Jefferson National Expansion Memorial in St. Louis, Missouri, to commemorate Thomas Jefferson and the westward expansion of the United States. Construction started in 1963, and the Arch was completed in 1965. It is now an iconic symbol of St. Louis and a popular tourist attraction.
TRUE-ish
The West. (BIN)
they opposed it
by fording