Final answer:
W. E. B. Du Bois and the NAACP supported the war against Germany for social justice and equality, seeing it as an opportunity to advance African American rights and promote worldwide democracy.
Step-by-step explanation:
W. E. B. Du Bois and the leadership of the NAACP supported the war against Germany for social justice and equality reasons. Believing that the conflict posed an opportunity to advance the rights of African Americans and to promote democracy worldwide, Du Bois saw participation in the war as a means to press for the social and political changes at home that he had long fought for. This is reflected in the Double V campaign, which emphasized victory over fascism abroad and discrimination at home, calling for progress in equality and civil rights.
Riding the patriotic wave and national unity during wartime, African American organizations like the NAACP saw an increased urgency in addressing racial inequalities. They hoped the nation's fight against totalitarian regimes abroad would reflect on its own internal social injustices and offer an avenue for change. Du Bois' stance encapsulated the spirit of this period, advocating for an end to US colonialism, putting an end to segregation, and fighting for the principle that defeating Germany could lead to global freedom, including for people of African descent.