Answer:
You didn't give us the choices but I can try to help.
Before the 19th century, imperialism consisted of mostly colonizing and taking advantage of an area's resources and people for gain. This changed in the 19th century since Imperialism became a larger focus of increasing the size of a country, where instead of simply taking advantage, the colonies were treated as small extensions of countries where the mainland would benefit from the trade and spread of their ideologies.
So basically, global competition between countries in imperialism and spread of influence increased drastically, and I think can be argued as one of the reasons why we had WW1 in the first part of the 20th century. The competition for the best country and empire became a global one instead of being treated as a way to simply get resources, and more about extending reach as well.
<span>C. They built aqueducts that carried water from the hills to the city.</span>
They want other people to do what they had made or did back then
I would say alliances and nationalism because nationalism only encouraged countries to go to war and prove that they were the best most powerful country around and in terms of WWI, nationalism led to strong dedication to the army and just keep most countries in the war longer than they should have been in it. Alliances were significant in the exact beginning of the war and the scale to which the war was fought. The many (secret) alliances led to austria-hungary and Serbia to sorta threaten each other, which brought Germany in, then France, etc.
He seize the happers ferry