What happens when a country 'buys' another country?

I think Uncle Sam bought Alaska from the Czar with very cheap price. Alaska is very rich in natural resources of oil, fishes, timber, and minerals. It seldom any person can buy the whole country and its sovereignty. Even the rich Chinese man is being intervened by the China government to buy less than 0.01% of the land of the Iceland for building tourist resort. Let me put it in this way, economically a group of rich powerful businessmen or politicians can manipulating the economic activities of a country and take advantages out of it of by means of colonization, or the Latin America was once named as the banana republic which is quite disparaging. For instance, Hong Kong has returned to China in 1997, the British still controlling many commercial property and investments of Hong Kong.
Yes, many countries sold land to the US but not the country.
http://search.yahoo.com/search?p=Did%20any%20country%20sold%20in%20the%20history?

do no longer trouble. Chavez will invade yet another us of a if ordered to, I mean if allowed to via the powers that be. so as long through fact the powers that be do no longer pick him to invade he won't.

It would be a more bigger country.For example, West and Eastern Germany. You call it buys,but they call it solidarity.

I've never seen an entire country bought (unless you count most of Congress). The US bought Alaska for $7.2MM from Russia and the territory of Louisiana from the French for $11MM. Both simply became territories of the United States upon completion of the sale.

To my knowledge, this has never happened. Being recognized as a nation-state requires more than proof of purchase. There are global political systems in place, like the United Nations, that must recognize the sovereignty of any nation. I don't think they would ever let that kind of transaction occur.