To allow the force of expanding gases from the gunpowder to act for a longer time
D. ancient seas because sedimentary rocks form when there is alot of pressure.
Manifest Destiny is a term for the attitude prevalent during the 19th century period of American expansion that the United States not only could, but was destined to, stretch from coast to coast. This attitude helped fuel western settlement, Native American removal and war with Mexico.
What is the options if there is any, i know the awnser
in the beginning, slavery mostly