The sponsor for Columbus and sponsoring Portuguese exploration was based on a common interest in trading and expanding their territory.
Explanation:
Prince Henry was also known as the navigator led his nation's exploration towards Africa and Atlantic nations. His mariners successfully established their foothold and built a trading empire in those nations. They also expanded their territory by colonizing the regions.
Columbus was sponsored by Ferdinand and Isabella for two major reasons. One is they wanted to establish trade routes to the Atlantic nations. To overcome Portugal in trading to win the rivalry between their countries. Another one is to expand their territory and Christianity.
The similarities between the sponsorship of the two explorations is that there was a common interest in trading and expanding their territory.
This refers to the search for lands and territories for the purpose of getting new information or finding new territories.
Hence, we can see that for the two explorations both Columbus and the Portuguese had a common interest in trading and also in expanding their territory.
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