In wars between British colonists and Australian Aborigines in the early 19th century, the British were consistently outnumbered but generally won. This is MOSTLY because of the colonists'

Widespread of modern guns  

Explanation:

Many of the war fought between the Australian Aborigines and British colonists during the 19th century. In the war, thousands of the Aborigins died. Technological and logistic advantages help the British to win the war. Aborigins skills based on hunting and fighting. They used weapons like spears, clubs, and other weapons. British used modern European guns including, the six-shot Colt revolver, the Martini-Henry rifle, the Snider single-shot breech-loading rifle, and the Winchester rifle.                          

d. migration of french settlers into english colonies

the underground railroad (apocope of the metropolitan railroad) is a system of urban trains located within a city and its metropolitan area. it is characterized for being a massive transport of passengers in the big cities, uniting diverse zones and their environs, with high capacity and frequency and in segregated form to other systems of transport. metropolitan railroads are built underground or on the surface, although most systems use mixed models where sections are combined in both modalities.

1 - as a result, the metro tends to reduce car travel for two reasons: first, due to the greater transfer of users from the car and, second, due to the reduction in the acquisition of cars in homes located in sectors near the stations of the metro.

2 -the metro allows to contribute effectively to the achievement of all the objectives of an urban development policy: it improves the efficiency of the city's economy by reducing travel costs and also generates a higher level of activities in the city center, taking advantage of of the agglomeration economies.

3 -it is a clean means of transport, since it uses renewable energy (usually electricity), taking care of the environment and avoiding excessive pollution.