Hitler was worried that the tanks where going to fast for the troops and stoped so they could cach up
It's generally felt that Hitler erred in stopping short of Dunkirk, thereby allowing the British army to escape (albeit leaving all their heavy equipment behind).
because it was full of asians
BEF The british Expeditionary Force
They didn't really want to capture Dunkirk. What they wanted to do was to destroy the allied army which went into Belgium to stop the German invasion through the low counties (i.e. Belgium Holland and Luxembourg). Having the Allied army go into Belgium was a part of the German plan to encircle the allied army (which they did around the town of Dunkirk) and then destroy the army before the allied evacuated its army to England by sea.
Codenamed Operation Dynamo by the British, the Dunkirk evacuation took place between May 26 and June 4, 1940,
The Germans did not lose at Dunkirk. Quite the opposite. Dunkirk was a mass retreat by the British army who had been overwhelmed in Europe by the Germans.
This is one of the most widely debated situations in World War II. Historians knew that Hitler was nervous about risking his tank forces, and he wanted to wait until more infantry arrived. There is also some evidence that the Luftwaffe alone would obliterate the trapped soldiers. Hitler might also have wanted to halt the invasion so that Britain would accept surrender more easily if Hitler didn't humiliate Britain by destroying her army.
Dunkirk
Dunkirk
Because the evacuation from Dunkirk saved 338,226 soldiers [British & French]. While equipment could be replaced men could not. Although a massive amount of equipment was lost, Dunkirk was probably Hitler's greatest mistake next to attacking Russia because if he had pressed home his attack he would have as good as wiped-out the army and destroyed morale. The saving of so many soldiers, against all the odds, gave a massive boost to morale in Britain - a boost that was never to be lowered, even during the blitz.
The British Expeditionary Force escaped from Dunkirk to avoid destruction and/or capture by German armed forces . The BEF reformed as the core of a reconstituted and resurgent British army that later fought with distinction on the European mainland (and elsewhere) .
In the summer of 1940, 338000 British and French troops were evacuated from the beaches at Dunkirk in Northern France after having been thoroughly beaten by superior German Forces. It was one of the worst defeats the British Army has ever suffered but propaganda at the time made it sound like a victory. There is no doubt that the logistics of the evacuation were nothing short of a miracle.