The success of the Roman army was based around the facts that it had excellent organization, great leadership, good training, good equipment, and that is was only consisted of professionals.
The Roman army had only professional soldiers in it. Not everyone was able to become soldiers, as certain physical criteria had to be fulfilled. The ones that became soldiers had training everyday. Tactical training, one to one combat, formation combat etc.
That led to the Roman army to be very successful in its military campaigns, especially because very often it was coming upon poorly organized armies, where most of the soldiers were either part-time soldiers, or just ordinary villagers.
The Spanish had been in the Southwest since the 1500s. They had created
chains of mission stations and fortresses called presidios throughout
the Southwest and up the coast of California (including Los Angeles).
The answer is the interest groups. It is because this is a
group where in people are joined together because of the shared purpose that
they all have and a way that they work together because of the fact of
promoting their interest, influencing others and protecting their own. They
will find outside strategies to be useful because their group are likely to
take part in social and political systems.

- Fishes are exclusively aquatic animals.
- Their skin is covered with scales/plates.
- The body is streamlined and a muscular tail is used for movement.
- They are cold-blooded and their hearts have only two chambers.
Hope you could understand.
If you have any query, feel free to ask.