Answer: (worker's rights) Women's suffrage
Women's suffrage was a progressive cause that was helped by US involvement in World War 1.
Step-by-step explanation:
U-boat attacks prevented the United States from trading freely with Europe and required U.S. involvement. Why did the nation's progressives oppose U.S. involvement in World War I? They opposed all war as being an obstacle to social reform. How can Wilson's reaction to the sinking of the Lusitania best be characterized?