I think it would be the failure to pass treaties. European nations are often in conflict over land territories and vast riches of the country. Another reason why the European countries always care in conflict, it would be religion. Many of them are firm believers Christianity. I think this was the reason why there was Crusades occur.
The answer is June 11, 2012.
I hope this helps.
The Six Basic Principles of the Preamble include:
#1 in Order to form a more perfect Union
#2 Establish Justice
#3 Insure Domestic Tranquility
#4 Provide for the Common Defense
#5 Promote General Welfare
#6 Secure the Blessings of Liberty
