The westward expansion era in the United States was one of great importance, as it helped to create the shape of the United States today. One of the reasons acquiring land was important was because it would help to complete America's manifest destiny. Manifest destiny is a term that states that it was America's god- given right to control all land from the Atlantic to the Pacific Ocean. This belief that it was supposed to be America's land caused them to buy land (like the Louisiana Purchase from the French and Florida from Spain) and even fight for it (Mexican-American War- results in US getting Arizona, California, Utah, etc.).
Besides completing America's manifest destiny, acquiring this land allowed the US to gain significant natural resources. A perfect example would be in California. After gaining California from Mexico, gold was found. This lead to the California Gold Rush of 1849. Finding this valuable commodity lead to a huge increase in the population of California and it gave the American economy a boost.
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What best describes the reason for US involvement in Japan, Korea, and Vietnam was the permanent intent of the United States government to instill the foreign policy of containment during the Cold War years. During that time. the Soviet Union tried to spread Communism over different parts of the world, as was the case of Czechoslovakia, EastmGermany, Poland, Romania, Bulgaria, Hungary, North Korea, North Vietnam, and the Island of Cuba.
That is why the United States tried to impede the spread of Communism at all costs because it went against the economic and political interests. The US attempt to contain Communist influence in Asia and Southeast Asia.
During the Cold War years, the US and the Soviet Union competed in the arms race, the space race, and the spread/containment of Communism.
From 1750 onwards a new industry emerged in Britain - the production of cotton cloth. Wool production had previously been Britain's major industry, but cotton had one key advantage - machinery could process cotton fibres better than wool.
An engraving showing slaves picking cotton on a plantation in North America
As a result it was in cotton production that the industrial revolution began, particularly in and around Manchester. The cotton used was mostly imported from slave plantations. Slavery provided the raw material for industrial change and growth.
The growth of the Atlantic economy was an integral part of the growth of exports - for example manufactured cotton cloth was exported to Africa.
The Atlantic economy can be seen as the spark for the biggest change in modern economic history. The Atlantic economy in the 1700s was founded on slave labour.