They needed help in their textile mills.
At the time of the arrival of Europeans, the indigenous population was estimated to be just below 40 million people. After the contact with European diseases it is said to be significantly reduced and estimates suggest that in 1650 this population could be around 8-9 million people. (this is just an estimate, but it's the best from all the offered answers).
Maybe the one at the bottom
The war-guilt clause in the Treaty of Versailles placed the blame for World War I on Germany. According to the Treaty, Germany was the sole culprit for WWI and therefore had to pay the consequences which included paying their allies for war expenses, among many other things.