Biden Proposes $4 Billion to Fix Root Causes of Migration | Time Biden's Immigration Bill Proposes $4 Billion to Address the Root Causes of Migration. It's a Start, Experts Say President Biden sent an immigration bill to Congress that includes fixing the root causes of migration, particularly from Central America. time.com [#1 Root out the root cause] 바이든이 그의 첫 업무일에 발의한 법안 중 하나는 새로운 이민법에 대한 내용이다..