It was the "Transcontinental railroad" that great helped to further the Westward Expansion in the United States after 1865, since although it wasn't oficially completed until 1869, it began to reach further and further west beginning at this time. 
        
             
        
        
        
According to interdependence theory, individuals are dependent on their partners when their partner's performance surpasses our CLalt.
Over a four-decade period starting in the 1950s, Harold Kelley and John Thibaut created the interdependence idea.
<h3>Why do we need interdependence theory?</h3>
Interdependence theory examines the significance of structure for comprehending intrapersonal and interpersonal processes and uses a thorough analysis of situation structure to pinpoint the most crucial aspects of interpersonal settings.
Be Vulnerable & Develop Trust these two ideas complement one another and serve as the fundamental enablers of dependency. People need to be vulnerable enough to let others take control of or co-own some component of their success in order to be mutually dependent.
Learn more about Interdependence Theory here:
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Answer:
D. Many jobs in large cities
Explanation:
Large cities results most times from industrialization; that is more industries are set up. This usually is a result of technology advancements. As we discover more ways of doing things, we set up companies to carry out this new means or method of implementation. Consequently we need people and likewise, this people need housing; so is the case of migration of people from rural areas to larger or more exposed areas for need of work for a better economic life.
 
        
             
        
        
        
1. The cotton gin - It impacted society in terms of the reduction of labor that removed seeds. 
2. Photography - It allows people to accurately familiarize themselves with far-off landscapes and cultures. Enabled the diffusion of objective information through the visual capture of things as they really are. 
3. Electricity -  Electricity helped to usher in industrial productivity on scales never before seen. Industries have been created to generate electricity for public use or transmit data through electrical signals .
4. The telephone - Quickness in communication, business, easier communication in wars
5. The locomotive - goods were transported overland easier reduction of labor. 
 
        
             
        
        
        
Answer:
Expert opinion
Explanation:
When Charles gave his talk about child labor in India, he included a brief excerpt of a video presentation by a sociologist who had written five books about the subject. This is an example of expert opinion.
Expert opinion is added when there is a need to validate the content through substantiated study. It supports ideas and gives more power and weight to what is being said.