That country has suffered under oppressive rule for many years.
The citizens resisted the tyranny.
圧政 describes an oppressive style of government or rule overall, while 弾圧 refers to specific acts of forceful suppression carried out under such rule.
Compound of 圧 (pressure, oppression) and 政 (government, rule). The exact historical derivation is uncertain, but the word is conventionally associated with the concept of oppressive governance.