What was responsible for the wealth of the kingdom axum?

The kingdom of Axum was wealthy from the profit of their two largest trade cities

Well, from looking at the question I am going to have to say that the answer that you are looking for is going to be somewhere in the lines of Profit from the location of there 2 main cities

The case was a u.s. supreme court decision that defined the scope of the u.s. congress's legislative power and how it relates to the powers of american state legislatures. the dispute in mcculloch involved the legality of the national bank and a tax that the state of maryland imposed on it.