Do you ever find it strange how conservative the USA is? And Europe isn't?

Actually it comes as no surprise. Even though our country is only 233 yeas old, we've had a stable government in place longer than most countries in the world. During that time, many European countries have undergone some radical changes, and there have been many border shifts as well. Just about every country in Europe has gone through more than one constitution, the exceptions being the United Kingdom, it has not written constitution, and San Marino, which has a constitution that is older than our own.