Which condition contributed to change in the population of Asia over time?

Who gave the famous "i have a dream" speech at the march on washington?

The social contact theory states that

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?