In 1861, Czar Alexander || issued an order A. freeing the slaves
B. ending serfdom
C. establishing a constitution
D. ending discrimination against Jews

(B) ending serfdom

Explanation: hope this helps !

“In St. Petersburg, Czar Alexander II signed the famous manifesto with provisions on February 19, 1861, the act on liberation of the peasants. Two years later, at the height of the Civil War, President Lincoln on January 1, 1863, in Washington, signed the no less famous Emancipation Proclamation freeing the slaves.”

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

native americans

american indians have appeared on many u.s. coins including the buffalo nickel

benjamin franklin learned a lot about democracy by observing the iroquois indian

the term "indian" originated with christopher columbus. he thought that he had reached the east indies when he landed in america and therefore named the inhabitants indians.

camping

camping can relieve stress and depression

your campfire may be a hazard

long-term campsites include permanent and semi-permanent setups and can lead to closer relationships with neighboring campers

buffalo

buffalo are herbivores and feed on about 60 pounds of plant material and grasses a day.

buffalo are considered to be an adult when they reach 3 years old.

buffalo’s tail can be almost three feet long, and they use it to swap at pesky bugs.