Yup! I don't see how I could have made it anymore clear.
There are two theories of international taxation. Territorial taxation, most commonly used around the world, is based on the notion that only a companyÂ’s profits generated within national borders are subject to tax, thus avoiding double taxation. The United States, however, is using the worldwide taxation system. Every American companyÂ’s income generated outside the U.S. is not only subject to a foreign countryÂ’s taxes but also to the U.S. taxation regime. Although the worldwide approach was once much more popular, about two-thirds of Organisation for Economic Co-operation and Development (OECD) countries (joined recently even by Japan and United Kingdom) now use the territorial system. Right now the United States is the only country subject to both a worldwide system and a corporate tax rate above 30 percent.
Americans for Tax Reform Center for Fiscal Accountability
Happy to educate you.
Interesting, and another point of view but, it is at best I can tell a right-wing funded org. It states transparency as a goal for everyone else BUT them. I can find no listing of supporters and where it gets its funding or donations but seeing a grover norquist is involved in this advocacy group I can see why there is no "transparency" to it's inner workings.
This from wikipedia; The primary policy goal of Americans for Tax Reform is to reduce the percentage of the GDP consumed by the government.[17][19] ATR states that it "opposes all tax increases as a matter of principle."[20] Americans for Tax Reform seeks to curtail government spending by supporting Taxpayer Bill of Rights (TABOR) legislation[21] and transparency initiatives,[22] and opposing cap-and-trade legislation[23] and Democratic efforts to overhaul health care.[24]
ATR is a member of the Cooler Heads Coalition, which takes the position in the global warming controversy that "the science of global warming is uncertain, but the negative impacts of global warming policies on consumers are all too real". ATR supported the Comprehensive Immigration Reform Act of 2006 and continues to favor a comprehensive immigration reform bill.[25]
ATR has called for cuts in the defense budget in order to reduce deficit spending.[26]
Is this your idea of getting both sides to a story?

You'll have to do better than that. BTW It explains nothing about off-shore accounts being taxed by the US.