Why and how were americans so reluctant to get involved in world war i?

President Wilson was reluctant to enter World War I. When the War began, Wilson declared U.S. neutrality and demanded that the belligerents respect American rights as a neutral party. He hesitated to embroil the United States in the conflict, with good reason. Americans were deeply divided about the European war, and involvement in the conflict would certainly disrupt Progressive reforms. In 1914, he had warned that entry into the conflict would bring an end to Progressive reform. "Every reform we have won will be lost if we go into this war," he said. A popular song in 1915 was "I Didn't Raise My Boy to Be a Soldier."

What does this mean ? ?