What were the various challenges Chinese immigrants faced at the turn of the 19th century?

Which common characteristic of renaissance buildings does this image show

Push-and-pull factors contribute to

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?