Early civilizations of mexico used the solar portion of the 52-year calendar round to

They used it to plan for their farming seasons.

Explanation:

The early civilizations in Mexico used the solar portion of the 52-year calender cycle (also known as “calender round”) to plan for their farming seasons, or periods of cultivation. Generally, the 52-year calendar round was also referred to as "Sacred and Solar cycle": The duration of the Sacred cycle/portion was 260 days, while the duration of the Solar cycle/portion was 365 days. The Solar cycle was regarded as the agricultural calendar because it depended on the sun—solar. Some of the early civilizations of Mexico included the Mayan, the Toltec, and the Olmec civilizations.

in the 1800s, chinese workers migrated to the united states, first to work in the gold mines, but also to take agricultural jobs, and factory work, especially in the garment industry. chinese immigrants were particularly instrumental in building railroads in the american west, and as chinese laborers grew successful in the united states, a number of them became entrepreneurs in their own right. as the numbers of chinese laborers increased, so did the strength of anti-chinese sentiment among other workers in the american economy. this finally resulted in legislation that aimed to limit future immigration of chinese workers to the united states, and threatened to sour diplomatic relations between the united states and china.

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