Dendrochronology is a method of dating based on the analysis of patterns of tree rings(also known as growth rings) hope this help!!! :)
Unrestricted submarine warfare (on merchant ships) and the sinking of the RMS Lusitania.
The Glasnost and perestroika contribute to the fall of the Soviet union because : C. they brought the outside and different economic political options to the people .
This will eventually lead to a lot of revolutions from those who wish to separate from the soviet union and lead to the fall of the soviet union
Political opponents of President John Adams opposed the Alien Enemies Act of 1798 because it stripped American citizens of the right to free speech, which blatantly violated the Constitution.