A bit more on my multiparty USA. There are 6 parties - Green Party, Labour, Liberals, Conservatives, Libertarian and the Tea Party. Here is a bit more about each one and their ideologies.
Green Party - On the left wing of the political spectrum, they're in favour of big government. Economically they want higher taxes, more borrowing and more spending except for defence which they want to reduce the budget for. A universal healthcare system free at the point of use is one of their major policies. Furthermore, they are soft on crime, drugs and immigration. They have a strong dislike of America's corporatist ways and want an end to outsourcing of services. They want a living wage of $15. Socially, they are extremely liberal going as far as championing ridiculous pieces of political correctness. Environmentally, they want greater environmental regulations, they endorse clean energies and want to make it illegal for people to doubt climate change and global warming. In an election, they'd get most of their support from some professionals and students. They are America's 4th largest party.
Labour Party - Social Democrats who believe in a larger government, more borrowing, spending and taxes. They have strong connections to America's trade unions and support greater employment legislation. They also support a universal healthcare system free at the point of use. Socially, they support legislation that end discrimination and racism. They support an extensive welfare system. They are against the death penalty. In an election, they'd receive support from those who live in inner cities and their CBDs. They are America's 3rd largest party.
Liberals - a big tent centrist party composed of the moderate wings of the Democrats and Republicans in OTL. Economically they are conservative believing in lower taxes, lower spending and lower borrowing and the free market. Socially, they are liberal believing in the rights of those who are considered minorities in society. They support Immigration reform and believe in giving amnesty to illegals. They are strong supporters of America's military - one of their major policies is to safeguard the defence budget - and they support healthcare reform. Their policies are best summed up by their election slogan of "Freeing our markets and our society". In an election, they'd win support mostly from America's middle class, well to do minorities and educated professionals. They are America's largest party.
I shall continue this later.