Provides access to millions of pages of historic US newspapers from the Library of Congress.
Chronicling America API is a free News API that requires no API key, is only available over HTTP and has unconfirmed CORS support.

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Yes. The Chronicling America API is listed in the News category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The Chronicling America API requires no authentication, so you can start making requests without signing up.
CORS support for the Chronicling America API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
No. The Chronicling America API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.