The country was in the middle of a war with another country. They were having trouble because their enemy was being supplied with weapons provided by the Donquixote Pirates. The kingRamen entrusted the Happo Navy with the mission to put an end to the supply of weapons going to the enemy.
Whole Cake Island Arc
After the Donquixote Pirates were brought down, the war involving the Kano Country ended. Bothered by the fact that Chinjao and the recently appointed Don Sai would be unable to attend, its ruler prepared to attend Levely.
The Stories of the Self-Proclaimed Straw Hat Grand Fleet
Upon returning to his homeland with Baby 5 and the Happo Navy, Sai spoke to his former betrothed, Uhoricia, and broke off his engagement with her. Sai and Baby 5 married afterwards.
Translation and Dub Issues
If written as Ka no Kuni (花の国,Ka no Kuni?), the name of the country can be translated to "Country of Flowers".
The Kano Country seems to be based on China.
This makes it similar to the Wano Country, as they are both based on countries in Asia. The names even sound alike.