Which european country entered world war 1 as part of the central powers but later switch sides to the allies in 1915

Why does reagan claim the united states needs a strong defense policy?

What is one example of trench warfare ?

How was the method of making pottery by using coils of clay better than simply shaping the clay by hand? it prevented pottery from cracking when fired. it created a watertight seal. it produced more attractive pottery. the pottery could be cut or stamped with designs.