Yes, generally speaking it is true that the European Union was established so european nations could trade together without so many restrictions, since they all united under a single currency.
One of the reasons, among few others, for the formation of the European Union was so that the nation members can trade freely between each other without restrictions. This was a big goal of the European Union because it was something that was enabling the economies of the country members to prosper and grow, as well as to start and support each other, and go out on the global market as a unified economies in order to be more competitive and more profitable.
What is the main reason the United States entered the war, according to Wilson? Wilson believed that the United States is determined to protect democratic ideals.
It would be "Tikal" that is the largest Mayan ruin and contains one of the tallest structures in Pre-Columbian America, although it's the actual temples within Tikal that count.