Trench warfare was the main style of war during World War I. It consisted of both sides of the war, called fronts, digging trenches in the ground for their soldiers to live and fight in. Trenches were deep ditches dug in the ground that were often cramped and dirty. As the dug trenches further forward, they would take more land in the battle.
This was a very slow process and often would result in tens of thousands of casualties for a few yards of land. This is especially true because of the heavy use of mounted machine guns that both sides of the war used. These guns would tear through enemies easily. This style of warfare was also vulnerable to bombings and gas attacks, as the soldiers were stuck in the trenches and the heavy poisonous gasses would sink into the trenches.
Democracy and freedom from post World War II Communist Russia.
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The "Clovis first theory" refers to the 1950s hypothesis that the Clovis culture represents the earliest human presence in the Americas, beginning about 13,000 years ago; evidence of pre-Clovis cultures has accumulated since 2000, pushing back the possible date of the first peopling of the Americas to 33,000 years ago.
It was the "Chinese Exclusion Act" of 1882 that excluded an entire ethnic group from immigrating to the United States, partly because of economic fears but also because of blatant racism.