> During the 20th Century, forces were sent by various presidents into countries such as Nicaragua to suppress rebellions without asking Congress. During the Cold War, dodging Congress not only continued, it increased. For example, the Korean War, which the U.S. was involved in for three years, was never officially authorized by Congress.

> In 2011, President Obama's failure to get Congressional approval for U.S. military actions in Libya raised accusations from both parties.

http://www.infoplease.com/us/government/war-without-congress...