Final answer:
Political parties shape public policy through creating and passing legislation, helping elected officials work together, and guiding proposed laws through congress.
Step-by-step explanation:
Political parties shape public policy in a variety of ways. One way is by creating and passing legislation. When a political party has a majority in the government, they can introduce bills and push for their passage. Another way is by helping elected officials who belong to the party work together more effectively. Parties can provide support and coordination, enabling their members to collaborate and pass policies aligned with their party's agenda. Finally, political parties also play a role in the policy-making process by guiding proposed laws through Congress and informing party members how they should vote on important issues.