The Legislative branch has the power to create, pass, reform, or abolish laws, as well as handle other things like impeachments. Although the Legislative branch is unarguably the strongest branch of the 3, it is still well-checked by the other 2. To pass a law, for example, after the legislative branch approves it, the executive branch must agree and sign it and the judicial branch has the right to rule it unconstitutional. Even getting a bill through the legislative branch is difficult as it must go through committee in both houses, debate in both houses, and passed in both houses.
Give me 3-4 sentences please!