What was the theory of nullification

Me asap with these two questions about wwi 20 points will be rewarded.1. what is the significance of the battle of somme? 2. how many years into the war did it take for germany to use poison gas on a large-scale?

Write the title date and stated purpose of the map you have chosen to describe what you learn from your careful review of the maps information. picture above

Which statement best summarizes the outcome of the haitian revolution? a. french colonists agreed to remain in haiti to the new countryplan its government.b. france gave up control of haiti, but it forced haitian leaders toallow slavery to continue.c. haiti established a short-lived democratic government, but it wassoon colonized again by spain.d. haiti became independent from france, but the fightingdevastated its economy.