Which type of technology did city planners adopt during the industrial age in an attempt to meet the needs of commuters

Railroad technology

Think of two types of transportation systems developed in cities during the Industrial Age: elevated trains and subways. Both are forms of railroad technology applied to city landscapes. By elevating railways above the streets or placing them in tunnels beneath the streets, city planners were able to increase commuter travel options and access.

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories