Why did Emperor Qin Shihuang think it was necessary to have so many warriors to protect his tomb?

Hey mate Because he was afraid someone will attack is your Answer

in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

explanation:

trade in silk, spices, and precious metals.

answer first choice