I added the united-states tag based on the location in your bio. Had your bio not indicated a location, I would have posted a comment requesting information about your jurisdiction, as it is pertinent to your question. Whether or not you can cash a check [called "cheque", where I come from] is based on laws and banking regulations — and those most certainly vary by jurisdiction [like the spelling].
It has been our practice to permit and encourage variations of questions by jurisdiction, when jurisdiction is a key concern, rather than attempt to answer a question for all countries in one page. (Consider if we didn't: should a U.S. answer to a question be voted to the top, over the Canadian, U.K., or Indian answer to the same question? Which gets "accepted"? etc.)
When a question touches on law, regulation, taxation, state pension plans, etc. then a jurisdiction should be specified. Notwithstanding, there are classes of questions which do not require a country tag (perhaps, e.g. household budgeting, debt reduction, etc.)
We have been using country tags here since day one. When I founded the site, I desired to promote international participation. As a Canadian, I felt that country tags would help avoid both (1) ambiguity, and (2) a "U.S.-by-default" first impression that visitors might have otherwise had if it wasn't clear the site welcomes questions from anywhere. An earlier incarnation of the site even had little flag icons on the major country tags, and you could often tell from a glance at the home page that users came from all over.
The country tags also let users who are interested in or expert on a particular country highlight questions of interest, and filter out those they aren't knowledgeable about.
Finally, the tags are also great for search engines. I imagine that people outside of the United States would tend to include the name of their country when they're interested in searching for information about local laws, taxes, and regulations. That's what I do, lest I get IRS results on capital gains taxes instead of those from the CRA.