Final answer:
The Mid-Victorian Period was marked by the expansion of the British Empire, technological innovations, and cultural movements like the Pre-Raphaelite Brotherhood; heightened social concerns were not a characteristic feature of the era, which was more focused on progress and industrialization.
Step-by-step explanation:
The detail that was NOT associated with the Mid-Victorian Period is heightened social concerns. During the Mid-Victorian Period, the growth of the British Empire was a defining feature, as was the proliferation of technological innovations, such as the telegraph and railways. The Rise of the Pre-Raphaelite Brotherhood, an art movement that emphasized detailed observation and a return to nature, rejecting the approach of established painters of the time, was also part of the cultural landscape.
However, while social issues were present during the Mid-Victorian period, the era was characterized by a confidence in progress and industrial advancements. The period saw an expansion of wealth and power for Britain, along with the emergence of a middle class that adhered to strict societal norms and moralities. Thus, heightened social concerns as a detail more accurately reflects the later Victorian or Edwardian period, when questions over inequalities and social reform became more pronounced.