Previously the US had enacted some low level trade sanctions or restrictions with Japan. Getting to the Embargos Acts of 1941 18 months early is not to difficult given the attitude towards Japan of many US citizens.
The collapse of France panicked the US into the mobilization legislation of 1940. That will definitely occur, and X2. OTL All Army and navy reservists were called to active service, the National Guard mobilized and taken into Federal service in the active Army. Provision for inducting over 700,000 volunteers and conscripts in 12 months. A blank check handed to the Depts of War and Navy to purchase modern arms. Efforts will be made to accelerate all that.
Perhaps the most important change in US mobilization will be getting to legislation that allows centralized Federal control of arms production and resource allocation. One of the hindrances of the 1940-41 mobilization period was the retention of a peace time economy. Free market meant the military arms program did not have priority for steel, copper, rubber, chemicals, or anything else. OTL the problem was not solved until legislation accompanying the DoW vs Germany & Japan gave the Federal government control of resource allocation. Enact that a year early & the US gets close to its production levels of mid 1943 in mid 1942.
Note that the Phillipines will be directly astride the Japanese LoC to the British and French colonies. And, the US Asiatic fleet, the 4th Marines, and Army 15th Infantry will all still be in China and directly in the line of fire adjacent to the British and French garrisons & gun boat fleet in China. Shooting incidents between Japanese & US naval, ground, and air forces are near certain.