Germany invaded Poland using tanks, aircraft, and artillery in a surprise attack called Blitzkrieg.

Effect

after the invasion Britain and France declared war on Germany because of the Poland invasion.

Germany invaded and occupied Denmark, with the Danish government surrendering quickly due to the overwhelming German military presence.

Affect

a relatively lenient occupation, where the Danish government was allowed to remain largely in power, although under Germany´s control and their resources.

Germany invaded and occupied Norway, quickly defeating the Norwegian forces due to the element of surprise, and ultimately forcing Norway to surrender on June 10, 1940

Effect

to secure vital access to the North Atlantic for their navy, particularly U-boats, allowing them to disrupt British shipping, and to protect the crucial supply of Swedish iron ore by controlling Norwegian ports, while also establishing important naval and air bases to threaten Britain further

Germany begin to invade and attack France by bypassing the Maginot Line via a surprise attack through the Ardennes Forest, leading to a swift French defeat and occupation and was later defeated within a month, leading to an armistice signed on June 22nd, and France was divided into a German-occupied zone

Affect

this led to Germany to dominate most of continental Europe, forcing the Allies to rethink their strategies, and isolating Britain

Germany attacked Britain.

Effect

the Royal Air Force (RAF) successfully defended Britain against the Luftwaffe, preventing a German invasion and ensuring Britain's survival, ultimately contributing to the Allied victory. 

On June 6, 1944, Allied forces launched Operation Overlord, the Normandy landings, marking the start of the campaign to liberate Nazi-occupied Western Europe, with troops from the UK, US, Canada, and France landing on the beaches of Normandy.

Affect:

D-Day began.

significant events in World War II included the start of the Siege of Leningrad, the Babi Yar massacre, and the attack on the USS Greer by a German U-boat, which escalated tensions between the US and Germany.

Affect:

Representatives of Britain, the United States and the Soviet Union met for the first time in the war.

The Battle of Stalingrad, a pivotal event in World War II, was a brutal and protracted urban battle fought between the Red Army and the German Wehrmacht perhaps one of the most important battle World War II.

Affect:

Nazis captured the city but was surrounded and force surrender.

the Axis forces launched a new offensive in the Soviet Union

Affect:

this battle led to the capture of Tobruk

a pivotal turning point in the North African campaign of World War II, resulting in a decisive Allied victory against Field Marshal Erwin Rommel's Afrika Korps.

Affect:

ended the Axis threat to the Middle East and Iran, boosted Allied morale, and paved the way for the Allied invasion of Sicily.

the U.S. Navy inflicted a decisive defeat on the Imperial Japanese Navy, destroying four Japanese aircraft carriers and turning the tide of the Pacific Theater of World War II

Affect:

resulted in a decisive US victory, halting Japan's expansionist ambitions and shifting the balance of power in the Pacific to the Allies.

not only did Germany invaded Poland.

Affect:

this led to Poland being captured by Nazis and under Germany´s control.

The query refers to the American general Douglas MacArthur, not a person named Douglas Martin Luther King, who was a prominent figure in the civil rights movements. MacArthur was a top commander during World War II and the Korea War, achieving the rank of General of the Army. 

Affect:

While Martin Luther King ´ s Jr.´s legacy is primarily known for his civil rights activism, his influence extends to the U.S. Army, inspiring a more inclusive and diverse military, and his vision of a "color blind" society is reflected in the Army's commitment to equality

Nazi Germany invaded the Netherlands, Belgium, and Luxembourg as part of Case Yellow, a swift military campaign aimed at Western Europe, resulting in the occupation of these countries

Affect:

The Nazi conquest of the Netherlands and Belgium during World War II led to widespread suffering, including forced labor, food rationing, persecution of Jews, and the establishment of resistance movements

Hitler planned to take over the soviet union.

Affect:

the campaign ultimately failed due to strategic blunders, the harsh Russian winter, and fierce Soviet resistance. 

British, France and Canadian troops storm the beaches in Normandy France, one of the Largest land and sea attack in history.

Affect: more solders died then in WWI.

the U.S destroyed every air base of japan

Affect:

this was a great lost for the Japanese.

Germany retreated because of the allies.

Affect:

this led to Germany lost.

the soviet surrender Berlin.

Affect:

the end of the soviet.

Hitler committed suicide.

Affect:

the defeat and end of Hitler.