How did machines get involved throughout the years?

Although the primary goal of a political machine is keeping itself in power rather than providing good government, machines have been responsible for restructuring city governments to centralize authority, improving facilities and services, helping to assimilate immigrant groups, and encouraging the growth of business and industry. Supporters of political machines say that they “work” and that consolidating power in the hands of a boss.

Explanation:a political machine is a political group in which an authoritative leader or small group command the support of a corps of supporters and businesses