A man in America in 33 AD never had a chance to convert - and it seems impossible that every Native American for 1500 years deserved to be banned, but then in 1500 suddenly some started being worthy of the gift of faith and salvation.
First off, let's 'fact check' your statements above:
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1. In 33AD Christ told the Apostles to "go and preach to
ALL nations". This would've included America. The Apostles bi-located and worked all sorts of miracles and they didn't go to America? God left an entire continent alone? No, God sent the Apostles everywhere, even America.
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2. The 1500s did not start the preaching of the Faith to America. Ever heard of Eric the Red, who sailed to America in the 900s (I think)? This is recorded history. Then we have Blessed Mary of Agreda who bi-located to teach certain tribes the Faith. What other saints did so in the past? Surely more events like this happened.
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3. How many "good, God-loving" Indians even existed? Just watch 30 minutes of the secular, anti-Catholic and famous docuмentary of Ken Burns on the American West. Almost all tribes at the time were warring against one another. Their entire culture revolved around war, fighting for animals, and power. Doesn't sound like they were following the natural law at all.
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Then the Spanish arrive to preach the Faith, and the Indians had access to horses and what did they do with this blessing from God? They used horses to attack MORE villages, and to go all across the country to invade, plunder, pillage and kill. Most of the Indians were savage beasts. Their religion was power. Only a very, very small few tribes even allowed the Europeans to
talk with them about the Faith. Most missionaries avoided 90% of the tribes for fear of instant death.
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And God is evil because He didn't give these savages (to use the term in the most violent way) an opportunity at the Faith? Good grief! Lord forgive us for doubting your Goodness! Learn some history man. And pray for wisdom to understand God's Divine Providence, who created all men and knew their souls from all eternity.