What were the socio-economic and domestic political reasons for the crisis of the Roman Empire?

Socio-economic reasons:

1. The ruin of small and medium-sized peasant farms;

2. Decline of trade;

3. The unification of large tracts of land in the hands of a few of the richest people in the empire;

4. Ruin and desolation of lands due to barbarian invasions;

5. Lack of sound economic policy.

Domestic political reasons:

1. Struggle for power of various parties and pretenders to the throne;

2. Destruction of the best parts of the army during internecine wars;

3. Lack of strong and united authority;

4. Separatism in some provinces.