Historians have labeled the years from 1870-1914 as the period of the Second Industrial Revolution. While the First Industrial Revolution caused the growth of industries, such as coal, iron, railroads and textiles, the Second Industrial Revolution witnessed the expansion of electricity, petroleum and steel.
Identity process<span> theory proposes that adjustment to aging can be conceptualized as involving the three </span>processes<span> of identity assimilation (maintaining </span>self<span>-consistency), identity accommodation (making changes in the </span>self<span>), and identity balance (maintaining a sense of </span>self<span> but changing when needed.)</span>
