Global central banks are unloading America's debt.
From January to June of this year, foreign central banks sold a net $192 billion of U.S. Treasury bonds, more than double the amount in the same period last year, when they sold $83 billion U.S.
China, Japan, France, Brazil and Colombia led the pack of countries dumping U.S. debt.
U.S. Treasurys are considered one of the safest assets in the world. A lot of countries keep their cash holdings in U.S. government bonds.
Many countries have been selling their holdings of U.S. Treasuries so they can get cash to help prop up their currencies if they're losing value.
The selloff signals pockets of weakness in the global economy. Low oil prices, China's economic slowdown and currencies losing value are all weighing down global growth, which the International Monetary Fund described as "fragile" earlier in the year.
