In a general sense, it was because of the oppression that Britain had put over the colonies that led to the Declaration of Independence. Some of the many factors included tax impositions, the Boston Massacre, Coercive Acts, and Common Sense by Thomas Paine.
Moreover, the declaration was written by a committee of five including Thomas Jefferson (primary author), John Adams, Benjamin Franklin, Roger Sherman, and Robert Livingston and ratified on July 4, 1776 in Philadelphia.
The 19th century was a period of great change and rapid industrialization. The iron and steel industry spawned new construction materials, the railroads connected the country and the discovery of oil provided a new source of fuel. The discovery of the Spindletop geyser in 1901 drove huge growth in the oil industry
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<span>Colonies hated the Stamp Act of 1765. It was passed by British Parliament on March 22, 1765 to raise money for British troops that present in the colonies. The American colonies were imposed with new taxes through the stamp on papers, documents and others. The colonist started a rebellion with arms against the British.</span>
Answer: The Truman Doctrine aided countries that were under the threat of communism. This includes political, military, economic assistance.