The issue of E-Commerce Taxation

E-commerce taxation is an issue about whether the government should put a tax on purchases made online by Americans. This is problem is very hard for the U.S. government to solve because online purchases include a vast variety of different website stores and corporations such as Ebay and Amazon. How would, if even possible, the government enforce the tax on every purchase, and what would happen if someone out of the country is also trying to buy from these multinational websites. On the other hand, we have the issue of Americans buying products from people overseas. Will the government be enforcing tax on those purchases as well? The problem is that the internet has helped expand these corporations that are hubs for these products and have become globally influenced.