The police have guns in the UK
And that's not true either. Only special units (like officers in an Armed Response Vehicle or Special Branch) carry weapons; you need to be licensed as an Authorised Firearms Officer.
In Britain, those selected for training in the use of firearms are usually older, more experienced officers. They have to pass tests in marksmanship and fitness. I guess that's why gun-related crime is still a very small element in British crime statistics. Last year there were about 4,000 armed incidents in England and Wales and 42 people died from gunshot wounds. In the US about 30,000 people each year are killed by guns - and another 90,000 injured.
If my maths don't fail me that's resp. 0,08 deaths per 100.000 inhabitants against 97 deaths per 100.000 inhabitants. Maybe the Brits have a point here.
Since the 1970 The black population exploded. Along with it came crime, drugs,welfare, our cities are in decay because of white flight.
Sir, let me respectfully disagree with you. You should make a difference between the African immigrants (which started around 1965, by the way) and the African-Americans. Obviously you are referring to the African immigrants, so the first group. Let me tell you that the African population in the US is just under 900.000 (out of a total US-population of about 309.350.000 people (census.gov/population/cen2000/stp-159/STP-159-africa.pdf).
Please have a look at the US Census and other sources: 19,4% of all adult African immigrants in the United States held a graduate degree, compared to 8,1% of adult white Americans and 3,8% of adult black Americans in the United States. This would suggest that America has an equally large achievement gap between whites and African/Asian immigrants as it does between white and black Americans.
Of the African-born population in the United States age 25 and older, 86,4% have a high school degree or higher, compared with 78,9% of Asian-born immigrants and 76.5% of European-born immigrants. These figures contrast with 61,8% of the total foreign-born population. Immigrants groups in general tend to have higher high school graduation rates than the native-born general American population.
So I am afraid, what you are saying isn't confirmed by actual, public data.