What allowed the us to send aid Britain while staying neutral?

President Roosevelt developed the Lend Lease Act which he was able to get the Congress to approve. This Act allowed the USA to sell, lend and lease funds, military supplies, medical supplies and food to the Allied Forces. He got around the neutrality laws with this act because he justified it as a way to defend the USA against the Axis forces while remaining a neutral nation. Trust me it skated right along the edge of being unlawful.