One criticism of the Lend-Lease Act is that it violated the concept of American neutrality and contradicted the principles of self-determination. The Act provided military aid to countries engaged in the war against Nazi Germany, such as the United Kingdom and the Soviet Union, which some saw as interfering in foreign conflicts and entangling the United States into war. Additionally, critics argued that the Act gave too much power to the President, as it authorized him to lend or lease war material to countries without approval from Congress, potentially bypassing the checks and balances system. This raised concerns about an excessive concentration of power in the executive branch.
