Answer:
some leaders entered war to suppress disorder in their countries
Explanation:
Socialist labor movements and the incline of strikes were a source of internal strife. Not only that, but the competition for lands abroad also led to rivalries among European states. Besides, industrialization offered new methods of building weapons and ships using iron, steel and chemicals for weapons, which helped military leaders grow mass armies.
Clarifying questions:
How did expansionism change the United States' role in the world?
How did the Monroe Doctrine affect relations between the United States and Latin America?
How did ideas about nationalism affect the way U.S. leaders saw the United States' role in world affairs?
How might the U.S. role as an economic power affect its position in the world during the 20th century?
The way in which expansionism changed the United States' role in the world was it made them more powerful through its capture of new territories and a booming economy.
This refers to the American policy of defending countries in the Western Hemisphere from external attacks.
The Monroe Doctrine affected relations between the United States and Latin America as they intervened in Mexico and were victorious which led them to gain new territories.
The way ideas about nationalism affected the way U.S. leaders saw the United States' role in world affairs is that they wanted to protect their interests on both their home soil and abroad which also led to the Monroe Doctrine.
The way the U.S.'s role as an economic power affected its position in the world during the 20th century was that it began to be regarded as a superpower.
Read more about the Monroe Doctrine here:
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(1) Power in West Africa shifted from kingdoms
in the interior to coastal kingdoms.
(2) Malaria was introduced to the tropical regions
of Africa.
(3) Islam became dominant in sub-Saharan
regions.
(4) Plantation agriculture was developed in the
Great Rift Valley.