How did Thanksgiving go on to be
an official holiday? Explain.

Thanksgiving came to be an official holiday in 1863, declared by President Abraham Lincoln.

Explanation:

The Thanksgiving feast between Pilgrims and the Natives was not public till Bradford's diary was given to be published in 1789. When, a magazine editor Sarah Josepha Hale came across this tradition celebrated by Pilgrims and Natives, she wrote letters to five Presidents asking to declare Thanksgiving, a national holiday. It was President Abraham Lincoln who paid heed to this request and with an idea  of unte the country during his presidency, he declared the last Thursday of November as a Thanksgiving day and declared it a national holiday. The date, however, was changed to fourth Thursday of November by President Franklin D. Roosevelt in 1941, to avoid shifting of national holiday (as some year may have five Thursday's in November).

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choose your topic and establish your purpose. a lot of writers struggle to define the initial focus for their paper.

create a list of main ideas. this is the brainstorming part of the writing process.

organize your main ideas.

flush out your main points.

review and adjust.

the answer would be in this answer. someone already asked the question.