What effect did these innovations have on the war?
they made the war last longer than previous wars.
they made secret operations extremely important
. they led to rapid changes in the size of armies
. they resulted in higher casualty rates than in the past.

. They resulted in higher casualty rates than in the past.

Explanation:

The First World War, formerly called the Great War, was a warlike confrontation centered on Europe that began on July 28, 1914 and ended on November 11, 1918, when Germany accepted the conditions of the armistice.

After six months of negotiations at the Paris Peace Conference, on June 28, 1919 the Allied countries signed the Treaty of Versailles with Germany, and others throughout the following year with each of the defeated powers. More than nine million combatants and seven million civilians lost their lives (1% of the world's population), an extraordinary figure, given the technological and industrial sophistication of the belligerents.

“the battle of stalingrad is not a turning point necessarily in strategic terms, because a lot more has to be done before the soviets can be certain of defeating germany,” says renowned world war ii historian richard overy. the germans had fought nearly a thousand miles across the soviet union to get to stalingrad.

president jefferson protested this interference in american trade. he sent james monroe to london to negotiate a treaty. jefferson wanted britain to stop taking sailors from american ships, and to stop interfering in the trade of neutral nations. monroe tried many times to discuss such an agreement. but the british foreign minister was always too busy to see him.

explanation: