To increase your land size you must explore and prepare new territory for colonization. This involves great effort and cost, as land must be prepared, scrub, trees cleared and new homes and protection built.

The more land you have the greater the cost of exploring new territory, as the land will be further away and harder to access.

The more acres you hold, the greater your population will be and people will travel to your lands in the hope of finding opportunity to make a living in your prosperous new kingdom.