Yup! These are all correct, I think! Congrats buddy! :)
Mostly because they believed that Britain needed them. They relied on Britain getting cotton and other resources from them while in reality the British didn't need it as much, which meant that their plans were wrong from the start and that they would eventually fail economically. This is why their economy started failing and their money started losing value so they couldn't manufacture things and they couldn't sell them which meant that they couldn't sustain the war effort and and couldn't sustain their struggle. Eventually they lost the civil war because of things like this.
The concept of concurrent powers responds to the fact that many actions are necessary to serve the people at both the federal and state levels. Most notably, the power to impose and collect taxes is needed in order to raise money needed to provide police and fire departments, and to maintain highways, parks, and other public facilities.
It caused many to question the role of the government.
