Why are modern people more likely to be stressed than people who lived 100-200 years ago?

The adaptive capabilities of humanity depend on the already created goods, creations, and the person himself.
Therefore, it can be assumed that a modern person is less adapted to abrupt changes, including such as stress, conflict, limiting it in desires .. 100-200 years ago there were not a lot of modifications, adaptations made to make human life easier. People themselves learned to extract resources, without automating this process, they met their needs with great difficulty.