On September 25, 2013, the Kindle Fire HD was upgraded as the third generation Fire, priced at US$139, and the Kindle Fire HDX was introduced. The Kindle Fire HDX had an improved graphics engine, double the memory, and triple the processor speed of the previous model.
Washington, wary of the dangers posed by an individual's becoming entrenched in the presidency, created a two-term tradition that remained intact until Franklin Delano Roosevelt's third consecutive election in 1940.
The subsequent passing of the 22nd Amendment of the United States Constitution in 1947 renders this election the only occasion in American history in which a candidate was elected to a third term as president (Roosevelt was elected to a fourth term in 1944, but he died only a few months into that term).