Territory Development/Management/Defense

Ch201, legendary magic martial artist reincarnates as a noble son. Mc becomes amazing warrior, leader, blacksmith, and improves and aids his familys land physically and politically

Ch98, isekai veteran uses his former 100 lives experience to live a relaxed life. Hes a prrince who develops an icey region

Ch222.5, noble son uses knowledge of his civil engineer former life to get his parents out of debt and improve his peoples lives.

Ch 302, reincarnated man uses his god tool to create a thriving farming community in the forest of death. He has many wives.

Ch81, isekaid baby abandoned in forest for dead. He is rescued by goblins and is raised by them
He uses his knowledge to get them a stable food source, earth magic, and monster evolution. He becomes chief of a mixed goblin, orc, alruane, imp fortified village

Ch275, man runs a country squeezed between 2 powers;the church, and the empire. The leviatan church holds sway in the countries to the west. The empire rules all land in the east. Natra is a kingdom that lies on one of the best land routes between the 2. The mc plays them against one another to survive

Ch78, Man isekaid as child abandoned in forest. Includes village development, greco-roman style warfare, nation building. The mc becomes king of rosice and has a stated goal of unifying the continent

Ch131 son of a noble knight house regresses, and uses knowledge to sace his familys fief, and play kingmaker to save the country

Ch29, noble 4th son is exiled as lord of remote region. Using his plant magic, a village grows with dyads, mud baths, and cat folk