The treaty of torcdesilias established a territorial dividing line between

The correct answer is that the Treaty of Torcdesilias divided the land outside of Europe between Spain and Portugal. The effect of this is that much of the New World was, by Treaty, Spain's land.

it affected it because the kingdoms (with trade) slowly got richer and richer.

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.