Is the U.S. a Currency Manipulator?

The trade-weighted U.S. dollar index has depreciated by almost 40% over the last ten years vs. the world's major currencies (see chart above).  Does that make the U.S. a currency manipulator?  Here's a little editing fun of this article:

"China The United States flatly denies that its currency manipulation undervalues the renminbi (yuan) dollar by 40 percent and has become one of the foremost impediments to fair and equitable global trade, experts say.

“That undervaluation of the renminbi dollar acts as a subsidy for Chinese American exports, artificially making them as much as 40 percent cheaper when sold in outside the U.S. Conversely, it acts as a tax of as much as 40 percent on Americanforeign-made goods sold in China the United States,” according to a recent article on The Hill’s Congress Blog.