Why was the purchase of Alaska by the United States in 1867 called "Seward's Folly"?

Why was the purchase of Alaska by the United States in 1867 called "Seward's Folly"? Americans didn't want to own a territory so far from the mainland and so close to Russia. Americans thought Alaska was nothing but a frozen wasteland and had no resources to offer. The United States had already annexed Samoa, and didn't need another Pacific territory. Americans thought the two - cents per acre price tag for Alaska was too expensive. PLEASEE I NEED HELP!