Why was la salle's expedition down the mississippi river important to france? france claimed all of canada. french claims extended from the st. lawrence river down the mississippi to the gulf of mexico. france was able to claim all of the ohio river valley.

B. Hope this helps sorry if I am a little late.

all of them are correct

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).