In a conclusive manner; in a manner to end deliberation, controversy, doubt, or contest.

adverb. In a decisive manner.

adverb. with firmness

adverb. with finality; conclusively

adverb. in an indisputable degree

"With the development of new trade routes around the southern tip of Africa by the Portuguese and the discovery of the New World by Columbus, the center of the Western world moved decisively from the Mediterranean to the Atlantic."

derisively