The Census Bureau’s most recent American Community Survey estimates more than 15.8 million Americans previously served.

The Census data also estimates that more than 4.4 million of the nation's 15.8 million veterans are 75 years old or older.

In four states and the District of Columbia, less than 50,000 residents are veterans: Vermont (33,725, or 6.3% of the ...

Al Jazeera looks at the US economy, demographics, geography and other indicators ahead of the November 5 elections.