Union of South Africa Declares War on Germany (1939)
On September 6, 1939, the Union of South Africa declared war on Nazi Germany, joining the Allied cause just three days after Britain's own declaration. The decision came only after a dramatic political showdown in Cape Town, where Prime Minister J.B.M. Hertzog's push for neutrality was narrowly defeated in Parliament, forcing his resignation and the return of Jan Smuts to the premiership.
A Dominion Divided
Unlike Britain's other dominions, South Africa was not automatically bound to follow the mother country into war. Under the Statute of Westminster of 1931, the Union possessed full legislative independence, meaning its entry into World War II required a deliberate act of Parliament rather than an inherited obligation. This constitutional reality set the stage for one of the most consequential political crises in South African history. Prime Minister James Barry Munnik Hertzog, leader of the United Party government, argued forcefully for neutrality, believing South Africa had no direct stake in a European conflict and citing the country's substantial Afrikaner population, many of whom harbored deep resentment toward Britain following the Anglo-Boer War of 1899 to 1902. Hertzog's deputy, Jan Christiaan Smuts, took the opposite view, insisting that South Africa's strategic interests, its membership in the Commonwealth, and the moral imperative to resist Nazi aggression demanded immediate intervention. The two men, once allies who had co-founded the United Party in 1934 through a fusion of their respective political movements, now found themselves on opposite sides of a debate that would fracture their partnership and reshape the nation's wartime trajectory.
Did You Know?
The vote that toppled Hertzog and brought South Africa into World War II passed by a margin of just 13 votes, 80 to 67. Had a handful of legislators voted differently, South Africa might have remained neutral throughout the entire war, dramatically altering the Allied position in Africa.
The Parliamentary Vote
The crisis came to a head on September 4, 1939, when the South African Parliament convened for an emergency debate following Britain's declaration of war against Germany two days earlier, on September 3. Hertzog introduced a motion calling for South Africa to remain neutral in the conflict, arguing that the Union should maintain its independence from what he characterized as another European quarrel. Smuts countered with an amendment calling for South Africa to sever diplomatic relations with Germany and enter the war on the Allied side. After heated debate that exposed deep fissures within the governing coalition, the House of Assembly voted on Smuts's amendment. The result was 80 votes in favor and 67 against, a narrow but decisive victory for intervention. The defeat left Hertzog with no viable path forward. He requested that the Governor-General, Sir Patrick Duncan, dissolve Parliament and call fresh elections, but Duncan declined, judging that Smuts could command a working majority. Hertzog resigned as Prime Minister immediately afterward, bringing an abrupt end to his tenure and setting the stage for a change in national leadership at a moment of profound global crisis.
Smuts Takes Command
Following Hertzog's resignation, Governor-General Duncan invited Jan Smuts to form a new government. Smuts, a seasoned statesman who had previously served as Prime Minister from 1919 to 1924 and had earned international stature for his role in founding the League of Nations after World War I, accepted the mandate. On September 6, 1939, his newly formed government formally declared war on Germany, aligning the Union of South Africa with Britain, France, and the other Allied powers. The declaration carried enormous weight beyond its symbolic value. South Africa's ports, particularly Cape Town and Durban, occupied a strategically vital position along the sea route around the Cape of Good Hope, a critical artery for Allied shipping once the Mediterranean became contested. South African troops would go on to fight in campaigns across East Africa, North Africa, and Italy, while the Union's mines and industries contributed vital resources to the war effort. Smuts's decision, though bitterly contested at home and a source of lasting division within Afrikaner nationalist circles, cemented South Africa's role as an active Allied partner and elevated Smuts himself to a trusted confidant of Winston Churchill, a relationship that would endure throughout the remainder of the war.