Its Election Day in the U.S.Voters will be lining up at polling stations across the country to cast their ballots.Some may think this is the perfect occasion to rock their Harris-Walz t-shirt or Make America Great Again hat in honor of their preferred candidate.But in some states, you wont be allowed to vote if youre wearing political gear.Thats because 21 U.S. states have laws against electioneering which essentially means campaigning that prevent voters from donning campaign apparel, buttons, stickers, or placards at the polls.The states with such laws include: Arkansas California Delaware Indiana Kansas Maine Michigan Minnesota Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Dakota Rhode Island South Carolina Tennessee Texas VermontBecause laws vary by state, its best to avoid any political references, as even apparel from a previous election (like an Obama 2008 shirt) or a button about a specific voting measure (like abortion amendments) could be banned.If you still want to show enthusiasm on voting day, wearing U.S. colors like red, white, and blue is a safe way to go.Similarly, there are also laws in the majority of states that prohibit other forms of electioneering within a certain distance of polling stations, such as handing out fliers and signing petitions.Click here for the full list of electioneering laws at polling stations in your state.RELATED STORY | Registration, provisional ballots and poll watchers: Here's what to know about voting on Election Day