Conversation so far:
who has the most military bases in the world
The United States is the largest operator of military bases abroad, with 38 named bases having active duty, national guard, reserve or civilian personnel as of September 30, 2014
where does the us have the most military bases
Germany, which fought the United States in both world wars, hosts more U.S. military bases than any other nation
which continent does not have us military bases
America has established more than 400 military bases on every continent except for Antarctica
why does antarctica not have us military bases
The Antarctic Treaty bans military activity in Antarctica, military personnel and equipment may only be used for scientific research or any other peaceful purpose

Question: when did the treaty come into effect
Self-contained rewrite: when did the antarctic treaty come into effect