What factors led to the new imperialism of the 1800s?

The New Imperialism was caused by several economic, political, social and technological factors.  

The Ecomic factors were the need for natural resources and the need to expand  the territory to the growing population and the markets as the economies gained strenght from the Industrial Revolution.

The Social factors were the need to spread Christianity and share the Western Culture  as well as the belief in Social Darwinism.

The Political factors were the need for merchants and naval ships, security and nationalism.

And finally, the technological factors were the advances in medical knowledge, weponry and overseas travel.

c.) the country needed a stronger central government.

hello!

according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

hope this