Do you think anyone will ever "really" MESS with U.S.?

Answer 1

They already did, at least twice.

1. In December 1941, Japan's 1st Air Fleet caused devastation in a surprise attack on the United States naval base in Pearl Harbor, Oahu, Hawaii. You can read all about it in wikipedia....
http://en.wikipedia.org/wiki/Attack_on_Pearl_Harbor

2. More recently, in September 2001, Al-Qaeda operatives succeeded in totally destroying the twin towers of the World Trade Center, and damaging part of the Pentagon. Again, wikipedia has the information ....
http://en.wikipedia.org/wiki/9/11

3. If you think about it, history is littered with various great setbacks and defeats that have been imposed on the USA. Here are just a few...
a) Sinking of the USS Maine
http://en.wikipedia.org/wiki/USS_Maine_%28ACR-1%29#Sinking
b) Failure of Intervention in Russia 1918-20
http://en.wikipedia.org/wiki/American_Expeditionary_Force_Siberia#Logistical_problems_and_casualties
http://en.wikipedia.org/wiki/Polar_Bear_Expedition#Withdrawal
c) Withdrawal from the Vietnam War
http://en.wikipedia.org/wiki/Vietnam_war#Total_U.S._withdrawal
d) Withdrawal from Somalia
http://en.wikipedia.org/wiki/Operation_United_Shield

4. Put the patriotic hype to one side, and just think for a minute. The most powerful country in the world has often lost to smaller countries. It must be embarrassing for you, but nonetheless these things have happened.