What article did you read Daniel Grey?
This article says "Canadian" researchers and North America. Last I checked, North America is not a country, so your obvious bias against the United States of America is apparent.
You ask, "Why does America always think it is the only country to be affected by things?" Please state every time the "country" of America has thought that it is the only country affected by things, so we can judge the validity of your statement. By the way, when did you stop beating your wife? Another statement that implies guilt with no actual proof.
The article doesn't state that the scientists discovered isostacy, just that "the scientists were able to construct an image of the long-vanished Laurentide ice sheet," so your statement, "Yet again, a group of scientists discover something that every other scientist knew long before them," only shows your ignorance, lack of reading comprehension, and bias.