Why did Spanish explorers come to the America?

Which of the following was not a result of early humans increasing proficiency at finding food

What was the atlanta race riot of 1906 ?

Drugs have a high potential for abuse. there is no routine therapeutic use for these drugs and they are not available for regular use. they may be obtained for “investigational use only” by applying to the u. s. drug enforcement agency. examples include heroin and lsd. which scheduled drug is this?