US neutrality-zone support in the Bismarck hunt

If Bismarck and Prinz Eugen entered an expanded American neutrality zone, would the United States alert the Royal Navy or launch a carrier strike?

American forces were already passing information to help the British find the German ships, making a direct US encounter less likely.

The question imagines the American neutrality zone extending far enough east for US forces to encounter Bismarck and Prinz Eugen. It proposes either informing the Royal Navy or launching a US carrier strike. American forces were already helping the British hunt by passing information needed to locate the German ships. That support helped the British find their targets before a direct American confrontation became necessary.