Kind of for the same reason the American Colonies split from England.

Kind of, except in reverse. UK had a lot of power in internal-EU politics. Now it won't. ¯\_(ツ)_/¯

It had the right and power to implement its own immigration policy. But it turns out the UK is so racist it doesn't even want to grant citizen status to those it had already granted to in law but then failed to process them.

For one thing it means that one person (e.g. Angela Merkel) doesn't get to unilaterally determine UKs immigration levels any longer.

Uk was one of the most powerful members of the EU before brexit and saying "one person (e.g. Angela Merkel) determine UKs immigration levels" is not correct.

UK is not part of the Schengen Agreement, like, Ireland they can decide if a particularity nationality need a visa, I have dual nationality and I can enter Ireland or Uk without a visa using one passport and need a visa using another.

Once the millions of migrants in Germany have the requisite EU papers they would be able to flood into the UK. Shengen is a complete red herring.

Asylum papers aren't citizenship, and do not give the rights a EU citizen has (I believe typically they don't allow to leave the country), so the UK can freely choose if it wants to let them in or not.

> I believe typically they don't allow to leave the country

They do:

> You can travel to the so-called Schengen states (Belgium, Germany, Denmark, Estonia, Finland, France, Greece, Ireland, Iceland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Austria, Poland, Portugal, Romania , Sweden, Switzerland, Slovakia, Slovenia, Spain, Czech Republic, Hungary) without a visa, if you do not stay longer than three months and you do not work there. [0]

In the EU that's a moot point anyway as I haven't seen any border control in years. So at least travel-wise they're quite free to move.

[0] https://handbookgermany.de/en/rights-laws/asylum/blue-passpo...

"To travel to many of these countries, however, you must apply for a visa in advance."

you need a visa, is not free to move.

UK and other Member States always had the right to decide for themselves with regards to immigration (movement between Member States was the only thing the EU influenced, and that was not up to Merkel or any head of state)

Other countries found a way to oppose her without leaving the EU. There was a lot of bad press and name-calling back then, but they made their point.

Someone must have sold you a bridge then.

No.