How did a need for power and control influence and start ww1?

Tension began to grow due to the struggle for control over the Balkan Peninsula.

Explanation:

Order in the Balkan Peninsula was subject to the collaboration between Russia and Austria-Hungary.  Austria-Hungary's power was unstable and under risk, which generated concern, so, in 1908 it added Bosnia and Herzogovina to its territory. This outraged Serbia (which was an independent Balkan country) and also Slavic Russia.

Serbia eventually grew its territory considerably during Balkan wars, which endangered sovereignty of Austria-Hungary. Russia then allied to France and Great Britain (which held tensions with Germany for territory and control over seas) forming the Triple Entente. On the other side, Germany an Austria-Hungary formed an alliance. Soon any conflict would lead into WW1, which was the case of Franz Ferdinand's assasination.

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

e. all of em

~courtney