The correct answer to this open question is the following.
The elements of the Celtic culture that survived their invasions were the following.
One of them was the way they forged iron and produced weapons such as blades. The Celtic technique influenced the Roman Army. Celts knew how to work with iron. Celtic metalwork and cultural traditions were an important part of the Iron Age in Europe, reaching far places in the Mediterranean.
Another key aspect that transcended was the way they saw and pa¿ractice religion. They focused on worship elements of nature. They could be considered spiritual people, not religious people.
Another important element was Celtic art that passed the test of time and influenced the Romans and can be admired even today in places such as Scotland and Ireland, where buildings and temples contain much of the influence of Celtic art.
Karl Marx once said; "I am not a Marxist!". He also once called his adherents "useful idiots". Karl Marx presented a strategy in communism much of which can be found in his book, Das Kapital.
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In the "Great Compromise," every state was given equal representation, previously known as the New Jersey Plan, in one house of Congress, and proportional representation, known before as the Virginia Plan, in the other.
Chamberlain's do nothing policy and make-nice attitude led to the invasion of both Czechoslovakia and also Poland. Hitler was emboldened to invade both countries when Neville Chamberlain came back from a meeting with Hitler and declared there would be 'Peace in our Time". He naively believed Hitler was not interested in conquest in Europe. Following the invasion of Poland, both France and the UK finally saw the truth of Hitler and declared war on Germany.