What are advantages and disadvantages of William Seward purchasing Alaska?

Seward and many other Americans believed that Asia would become an important market for the country's products, and expected that Alaska would serve as a base for American trade with Asia and globally and for American power in the Pacific.

a, c, & d are correct:

they wanted lands to settle the extra population.

they wanted new markets for english goods.

they wanted to avoid civil war.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.