How were the Mayans able to develop a calendar system?

Mayans had an elaborate calendar which was one of the most accurate to have been created by any ancient civilisation. The calendar had a lunar cycle, a solar cycle and Long Count cycle. Mayans were able to create such an accurate calendar thanks to their brilliant knowledge of astronomy and their skill in mathematics.

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the following best describes postwar era writers in their works:

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.

freedom of speech is also protected by the 1 amendment.

explanation:

here is pretty much what the 1st amendment says:

congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.