According to the Declaration, the king denied life, liberty and happiness by preventing the colonists from establishing their own laws, making them in a way "prisoners" to the laws dictated across the sea which shouldn't have to apply to their life in the new continent.
Also by prohibiting them from trading with the rest of the world, the lives of colonists in America became dulled with the inability to reach out and expand their vision.
And finally by keeping armies in the new world during peaceful times and forbidding the new citizens to receive trial by jury.
By blocking their ability to pass laws, the king limited the colonists' liberty. By punishing and killing those who disagreed with him, he violated their unalienable rights.
It's possible but extremely unlikely to Revive an extinct animal but It is possible to create an organism similar to whatever extinct animal that is in question using its dna or the dna of its relatives. If scientists did revive extinct populations it could have an extremely detrimental effect on humans and our environment.
1. they finally joined the war because Germany embarked on a deadly gamble. Germany sank many American marchent ships around the British isles which prompted the American entry into the war