We still have the issues of Northern Ireland, the Rock of Gibraltar, and the Malvinas Islands, among other issues.
I did not agree with the Queen on a lot of stuff, but no one could ever question her dedication to her people.
And the Constitutional Monarchy is a good form of government, France should have kept their King, and Spain was wise to put a Bourbon back on the Throne of Spain. I also love the Grimaldi family of Monaco ( I attended the same acting school as Princess Grace Kelly, the AADA. Now her Granddaughter Princess Carlota Casiraghi is my favorite Royal in Europe. )
In the USA we have our Constitutional Republic that often contradicts itself, we had Carter who supported the Sandinistas, while we had Reagan who supported the Contras, while England never had problems like that because the Queen kept England consistent.
With the USA our allies never know what to expect as we change leaders and everything changes as the leaders change. There was a huge difference between Obama and Trump, and England never had that problem because they had the Queen.
Salute,
Tony V.