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Hi to all
anyone knows how I can improve the success percentage of colonize a land? thanks

Most of the stuff from the EU2 FAQ is still valid:
https://forum.paradoxplaza.com/forum/index.php?threads/colonization-faq-v1-08.200085/

e.g. having a Conquistador in the province to colonize, concentrating on a small number (depending on the administrative skill of the ruler) of colonies and building them up to cities before founding new colonies, if you have enough settlers create a trading post first and then the colony...