The primary effect of the Dred Scott decision, based only on the option in this list, was that "Congress could not prohibit slavery," but mostly it meant that blacks weren't considered citizens and thus could not sue for their freedom.
Pros
Exploring the unknown
Developing technology
Testing and experimenting with unknown aspect in physics -
Creating new theories
Cons
Other issues are more important
Can be a waste of money if theories can be validated
There are dangers and risk that are unknown in space
Hope it helps
If im correct the answer should be Submarines and mines were an inexpensive and better way to engage battleships. I hope this helps. let me know if it doesnt
The Roman Empire conquered many countries in three different continents. The continent of Europe included parts of Gaul, (Modern day France, and surrounding countries.) Spain, Britain, The Italian Peninsula, and Greece/Macedonia. In Asia and Africa the Roman Empire conquered parts of The Holy Land, Egypt, and Carthage.
