Answer:
C. Trench warfare
Explanation:
A's incorrect as alliances have existed for thousands of years
B's incorrect as an infantry charge's greatest weakness is the machine gun for obvious reasons
D's incorrect as both sides had machine guns, and was not the reason for victory.
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This leaves C, which makes sense as troops would be forced to hide on lower ground due to the deadliness of machine guns
Before the 1800s, builders used cast iron. But they found that structural steel beams set in concrete allowed them to frame tall buildings that were more fire resistant and more structurally sound than cast iron. Since that time, steel has not only become the best building material for commercial construction but closely tied to economic health.
The us join ww2 after pearl harbor
D- The arrival of the Europeans where in 1500s Cristopher Columbus conquered; South America, The Caribbean and claimed the discovery of the "East". Columbus killed millions of Native Americans, and South America became colonized by Spain while the American Indians were forced out of their lands. In the early 1500s, Its estimated that over 350,000 to a million American Indians lived in Florida and shared common characteristics, i.e., societal organization, spiritual beliefs, participation in trade and spoke different languages. They were severely impacted by colonialism whereby 1700 some cultures had perished while others emerged.
