Leaders in Europe are trying to stop a big tax on things they sell to the U.S. The U.S. President is unhappy because Europe sells more to the U.S. than it buys. Europe says that if you also count online services, the U.S. sells more to Europe. To change this, Europe could buy more gas from the U.S., spend more money on defense with U.S. companies, or make taxes on foreign cars lower. But, it's hard to fix problems with Europe's rules about food and their sales taxes. Experts say that if the U.S. puts this big tax on goods, the economy in Europe could get smaller by 1% next year, and businesses might invest 6% less money.