The two most popular traditions for Halloween in the United States are:

1. Carving Pumpkins: Carving pumpkins, commonly known as jack-o'-lanterns, is one of the most cherished Halloween traditions. Families and friends gather to select pumpkins, carve intricate or spooky designs into them, and illuminate them with candles or LED lights. These jack-o'-lanterns are often displayed on porches and in windows to create a spooky and festive atmosphere.
2. Trick-or-Treating: Trick-or-treating is another widely beloved Halloween tradition, especially among children. On the evening of Halloween, kids dress in costumes and go door-to-door in their neighborhoods, ringing doorbells and saying "trick or treat." Homeowners greet them with candy, sweets, or small treats. Trick-or-treating is a fun and community-oriented activity that allows children to enjoy the thrill of Halloween while collecting goodies.

These two traditions have deep cultural roots and are central to the Halloween experience in the United States. While there are many other Halloween customs and activities, carving pumpkins and trick-or-treating are among the most iconic and enduring traditions celebrated across the country.

1. blogs.loc.gov - The Origins of Halloween Traditions | Headlines and Heroes
2. ef.com - 5 spooky Halloween traditions in the US