how could i fix it even better????

Question

Not only was the United States justified when they declared war on Britain, they also created many positive effects for Americans as well. Some of the positive effects included a surge in American patriotism, a weakened Native American resistance, and a growth of U.S. manufacturing. And United States want to keep trading so that their economy will being better. The last thing is that because the Britain has a war with United States before so that the American were mad at them so they decide to have a war with Britain instead of France.
The first main reason is that United States would continue to trade with other country especially is France. Because trade could help grow up the economy of United States. Since United States choose the be neutral, not siding with one country or the other. So their economy is being very bad. And Britain made it hard for the United States to remain neutral.
The other reason that United States should justified in declaring war on Britain in 1812 is because the Britain has a war with United States and Britain stole their right so the American decide to having a war with Britain instead of France.
The effects of the war has made three thing happen. The first one would be the heroic exploits of men such as Andrew Jackson and Oliver Perry increased American patriotism. Second, the war broke the strength of Native Americans, who had sided with the British. Finally, when war interrupted trade, the Americans were forced to make many of the goods they had previously imported. This encouraged the growth of U.S. manufactures. The United States had also proved that it could defend itself against the mightiest military power of the ear.
As you can see, that the United States was justified in declaring was on Britain in 1812. There are many positive effects than negative effects in the war. Like increase American patriotism, weakened native American resistance and U.S. manufacturing grew. Also that Britain and France did not let United States to trade with them and they impressments to American. So the United States need to decide that who are they going to have a war with. Also because the Britain has a war of Independence with United States so American decide to have a war with Britain than the France.

Answer 1

'The last thing is that because the Britain has a war with United States before so that the American were mad at them so they decide to have a war with Britain instead of France.'

Change to:
Finally, because of the prior conflicy between the US and Britain, the US declared war on Britain instead of France (i am not commenting on the content of this paper, only the grammar)

Answer 2

You could make it better by correcting several spelling and grammar mistakes. And don't use and to start a sentence.