why is U.S. dollar so low now==

1, US is fighting 2 wars and requires billions to keep soliders oversea, so US goverment have no choice but to print more money.

2, Subprime crisis in US, Fed has increase liquity in the market, which mean printing more money to cover up mistake make by big brokerage firms.

Since currency is no longer gold based simple demand and supply, when US bond and notes are planty market will press it down.

http://hk.finance.yahoo.com/currency/convert?from=USD&to=CAD&amt=1&t=5y
five years depreciated almost 40%
what's goonna to be happen in next ......

The reason is that,
US maybe lower the interest rate,
The economic growth seems slow down