The EU wants to stop a big tax on things from Europe. The U.S. leader is not happy because Europe sells more to the U.S. than it buys. The EU says that if we count online services, the U.S. sells more. To sell more U.S. things, the EU could buy gas or spend more on defense. They could also make taxes on cars from other countries lower. But, rules about food and taxes in Europe are hard to change. Experts say that the new tax could make the economy in Europe smaller.