America is Armed to the Teeth, With the Highest Civilian Gun Ownership in the World

With fewer than five percent of the world's population, the United States is home to roughly 35-50 of the world's civilian owned guns.

Source: 2007 Small Arms Survey

Largest arsenals
The United States ranks highest in the world for weapons possession per 100 people in 2007

Firearms per 100 people:

US 90
Yemen 61
Finland 56
Switzerland 46
Iraq 39
Serbia 38
France 32
Canada 31
Sweden 31
Austria 31
Germany 30
Saudi Arabia 26
Greece 23
Angola 21
Thailand 16
Australia 15
Mexico 15
South Africa 13
Turkey 13
Argentina 13
Italy 12
Pakistan 12
Spain 11
Russia 9
Brazil 9
Columbia 7
Ukraine 6
England & Wales 6
Iran 5
Philippines 5
India 4
China 3
Nigeria 1

For the complete survey, link here

Note, the above data does not mean that 90% of all Americans own guns, it simply means that for every 100 Americans, 90 small arms are owned, in other words, there is obviously stockpiling by some.