Which Isekai Light Novels Focus On Strategic Kingdom Building?

A witch who has lived for thousands of years has grown bored with her own life and decided to leave it. Since she is an immortal, her soul cannot leave the world. However, what she can do is transfer her soul to another body. By a stroke of luck, she happens to enter the body of a princess. She was considered a miracle because when the Empress gave birth to her, the princess instantly died, along with the Empress. What the witch didn't know was that she has entered such a predicament. She has to endure the love of the cruel Emperor and possessiveness of the crazy twin princes! What will her life be at the hands of such a loving family? In addition, it seems that this body contains mana that was lost in the royal family centuries ago!

Evy was a simple-minded girl. If there's work she's there. Evy is a known workaholic. She works day and night, dedicating each of her waking hours to her jobs and making sure that she reaches the deadline. On the day of her birthday, her body gave up and she died alone from exhaustion. Upon receiving the chance of a new life, she was reincarnated as the daughter of the Duke of Polvaros and acquired the prose of living a comfortable life ahead of her. Only she doesn't want that. She wants to work. Even if it's being a maid, a hired killer, or an adventurer. She will do it. The only thing wrong with Evy is that she has no concept of reincarnation or being isekaid. In her head, she was kidnapped to a faraway land… stranded in a place far away from Japan. So she has to learn things as she goes with as little knowledge as anyone else. Having no sense of ever knowing that she was living in fantasy nor knowing the destruction that lies ahead in the future. Evy will do her best to live the life she wanted and surprise a couple of people on the way. Unbeknownst to her, all her actions will make a ripple. Whether they be for the better or worse.... Evy has no clue.

The story takes place in the medieval time of kings and queens. In the place where there are four kingdoms with the names of the four seasons. Two large arranged marriages begin a terrible event, which will change everyone’s life, turning them into other people. Belle, the queen discovers that her own son was killed by her husband under the command of his mistress. Cassian, has a bad relationship with his father, after the death of his mother, he is hated by his people, is a man without mercy to his enemies. But after discovering that his father plans his death in a war, he is forced to team up with Queen Belle to prevent the war from happening, as her husband is also plotting against her for his death. The two embark on a journey in search of an unknown kingdom never seen, but always spoken of in mystical stories of the kingdom. In the midst of all this obstacle that arises, Cassian is injured, Belle kidnapped by outlaw men, but manages to escape to the kingdom ruled by women. Meanwhile, in his kingdoms, King Cassian’s best friend joins his father at the beginning of the war.

In a world filled with corrupt leaders and chaotic times can love overcome and reform a broken Kingdom? Aria Primrose, a lowly Celestial farm girl, is drafted into the Alliance Military Academy, due to finding herself in the unique position of bonding to one of the only two dragon familiars in the realm. In order to overcome the challenges of the academy she must unite with the surly assistant teacher, Xavier Knight, and his even surlier dragon familiar. Will they be able to pull back the layers of deception and corruption to find the truth or will they be buried right alongside it?

Princess Celeste is about to marry Prince Senya of Alastia, one of the world's most dangerous kingdoms, after She is forced into an arranged marriage in order to save her kingdom, the king bestows the true crown on his son, now wanting revenge against her father before leaving she sets the castle on fire causing a secret retaliation from her father. What happens if instead of peace it's the exact opposite? Problems arise when Erena starts a war with Alastia; But will Alastia be the one to end it?

He was once a simple boy, drifting aimlessly along with the flow of the world. But one day, he awakened to find himself being different from his usual self, finding himself now hosting the body of a newborn. He had been reincarnated, that too as the sole prince and heir of the human empire. Now living in a world of sword and magic, filled with fantastical beasts, demi-humans, divine beasts, Goddesses and so much more. Life finally seemed to take a turn for the better for the reincarnated boy. However, as always, reality had its cruel ways of disappointing him. His parents died shortly after his birth in a war to save humanity, subjecting him to the life of an orphan. All the people vying for the throne turned against him, looking for any and all opportunities to kill him, the last living heir to the throne. Fortunately, he had his aunt, his last living family, who helped protect him by becoming the acting queen but this came with the price of being holed up in his palace till his ‘awakening’ which would enable him to defend himself and survive in this cruel world…