After the United States purchased the Louisiana Territory, America’s western boundary shifted to the , which is a(n) boundary.

Rocky Mountains; physical

Explanation:

United States and France came into the agreement of the land which is popularly termed as The Louisiana Purchase. It was the United States that acquired the large part of the land situated in the west of the Mississippi River. The territory of Louisiana covered the area as  Mississippi river in the east to the Rocky mountains in the west. It stretched from the Gulf of Mexico in the south the Canadian border in the north.

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on

demand is the need and oportunity to buy a given good or service.