What is the origin of the idiom "square deal" and when to use it?

The idiom "square deal" originated in the United States during the presidency of Theodore Roosevelt. Roosevelt popularized the term as part of his political agenda, which focused on promoting fairness, equal opportunity, and combating corruption. The phrase itself predates Roosevelt, but it gained widespread usage and recognition during his presidency, from 1901 to 1909. It is commonly employed in discussions about business transactions, negotiations, and agreements, highlighting the importance of equitable terms and fair practices.