What changes took place in the 3rd century in the life of Roman society?

There are such changes in the life of Roman society:

1) The provinces wanted to achieve independence;

2) Christianity spread gradually;

3) Frequent attacks by barbarians on the borderlands of the Roman Empire, which weakened it until the very collapse;

4) There was a centralization of the power of the Roman emperor;

5) Columns appeared – half-free farmers who gave part of the harvest.