What was granted to 40 Native American tribes between 1731 and 1745?

The correct answer is land grants. Between 1731 and 1745, the Spanish Crown granted land to various Native American tribes in an effort to establish alliances, secure loyalty, and encourage agricultural development in newly colonized areas. These land grants were significant because they recognized the tribes' presence and role within the territorial claims of the Spanish Empire. The grants aimed to cultivate a sense of cooperation and integration by providing Native Americans with defined territories where they could live and work.

In contrast, educational reforms, military protection, and trade agreements, while important aspects of colonial relations with Native Americans, did not constitute the primary focus or the specific actions taken by the Crown during that particular timeframe. The focus on land grants reflects the historical context of the era, highlighting land ownership and usage as a crucial part of the relationship between the colonial powers and Native populations.