Because both wanted power over North America and also they wanted land.
Its mostly a stylistic choice although at one points it was mostly a heat related idea. Hot air rises so having a steep roof allowed for the accumulation of hot air. It was also a good windbreaker so a collection of houses were able to stop a lot of the harsh wind from damaging things.
Answer:
the action or process of gradually reducing the strength or effectiveness of someone or something through sustained attack or pressure.
"the council is trying to wear down the opposition by attrition"
Explanation:
Hope this helped Mark BRAINLEST!!!
