Panama: Panama was the first Latin American country to adopt the US dollar as official currency.
Panama: Panama also has another currency, the balboa. However, unlike the US dollar, only balboa coins are minted.
Puerto Rico: Puerto Rico has been a US territory since 1898, and as such, the US dollar is the official currency used in the Caribbean island.
Puerto Rico: Nearly half of the island's approximately 3.3 million residents live in poverty, according to the US Census.
Ecuador: Ecuador introduced the US dollar as the official currency in 2000, after years of soaring inflation under the sucre (the country's former currency).
Ecuador: The switch to the US dollar brought other problems to the nation, such as a crisis of counterfeit money.
Guam: Located in the Western Pacific, Guam is a US territory and has used the US dollar as currency since 1950.
Guam: As most goods are imported, the cost of living is actually higher than in the US. Groceries, for example, can be over 20% more expensive.
El Salvador: The Central American nation also has the US dollar as its official currency. The USD replaced the cólon in 2001.
Liberia: The West African country has two currencies. The Liberian dollar is the nation's official currency, but the US dollar has legal tender too.