The treaty of versailles declared Germany guilty of aggression.
Germany was forced to pay 33 billion dollars and many parts of it like Alsace lorraine, coal mine at Saar were given to France.
Moreover it had to supply huge amounts of coal to Belgium and Italy as well.
Its army,navy and ships were reduced.
In short, it had to take over the blame and responsibility of the World War1
By far the most prominent black entrepreneur of the century of was Charles Clinton Spaulding (1874 – 1952), president of North Carolina Mutual Life Insurance Company in Durham North Carolina. It was the nation's largest black-owned business. That’s my thoughts on it, I could be wrong so check in with others too.
A) German soldiers were no longer willing to fight
The plessy decision had tremendous effect in society at large at the time as it legitimized racial segregation on an institutional level.
By separating public facilities such as schools and going as far to even exclude black people from transiting public space like many beaches, restaurants and hotels, African-American institutions were effectively put at a huge disadvantage in every regard. Some of the consequences were a massive peak in aliteracy within the black community, for example, and the denial to their political leaders from continuing to advance in a system that removed their ability to further participate. In the south, they also were almost completely erased from voting registrations.
Hope this is helpful to you!