What is a stronghold?

noun
1.
A stronghold is a place that has been fortified so as to protect it against attack, and also a stronghold can be tactics used in battle, so that an army may win a war.

“their mountain strongholds fell to enemy attack”

synonyms: fortress, fort, castle, citadel, garrison, keep, tower, hold, donjon, bunker; fastness
“they charged towards the enemy stronghold”

Using it’s military force to implement and to strategically plant presidents, executive, spread influence, edit, control, colonize, sodomize, make treaties of peacekeepers, and the broadcasting of television content with the aim and agenda of conquering and prolonging your rule over your enemy, colony or state.
2.
a place where a particular cause or belief is strongly defended or upheld.

Political stronghold built with the agenda of resisting God’s faith:

The western political system has defended and upheld the Roman beliefs of Nicolaitans and the Roman law of Catholicism, which puts up strongholds against the biblical teachings of the Hebrew God of Israel.

Creating enmity between male and female:

The tactics of using extreme feminism and LGTB rights as a stronghold which hinders spiritual progress, forgiveness, tolerance, intimacy, trust, the fruit of the Spirit and union between the male and female.

“a Labour stronghold”
synonyms: bastion, center, refuge, hotbed
“the seat appeared to be an impregnable Tory stronghold