Print out or download all pages you plan to use in your research so that your bibliography will be complete and accurate. Make sure to start with those trusted sources, and then look for any potential bias. Bad grammar or misspelled words.
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Why does this all matter? Has the content been through an editing process or been peer reviewed? This is the bit after the last period in the domain name.
However, a page discussing the Civil War is likely still relevant today even if the page was created in and has not been updated.